package com.imddy.spbatch001.config;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import java.util.TimeZone;

@Configuration
public class JacksonConfig {
    @Primary
    @Bean
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper getJacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        objectMapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, false);
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        // 通过该方法对mapper对象进行设置，所有序列化的对象都将按改规则进行系列化
        // Include.Include.ALWAYS 默认
        // Include.NON_DEFAULT 属性为默认值不序列化
        // Include.NON_EMPTY 属性为 空（""） 或者为 NULL 都不序列化，则返回的json是没有这个字段的。这样对移动端会更省流量
        // Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化
        //objectMapper.setSerializationInclusion(Include.NON_EMPTY);
        //过滤空值
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        //		// 字段保留，将null值转为""
        //		objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
        //			@Override
        //			public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
        //					throws IOException, JsonProcessingException {
        //				jsonGenerator.writeString("");
        //			}
        //		});
        return objectMapper;
    }

}